Analysis of the Generation State of Fine Precipitates in Steel
Fine precipitates in steel have various effects on the properties of steel products. Therefore, it is important to investigate the state of existence of precipitates in steel in order to consider their effect on the material. In this study, the size and shape of Nb and V precipitates were observed b...
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| Published in | ISIJ International Vol. 62; no. 5; pp. 897 - 903 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
The Iron and Steel Institute of Japan
15.05.2022
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0915-1559 1347-5460 |
| DOI | 10.2355/isijinternational.ISIJINT-2021-401 |
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| Abstract | Fine precipitates in steel have various effects on the properties of steel products. Therefore, it is important to investigate the state of existence of precipitates in steel in order to consider their effect on the material. In this study, the size and shape of Nb and V precipitates were observed by electron microscopy and the amount of precipitates was evaluated by electrolytic extraction analysis in martensitic stainless steels which has excellent heat resistance. For steels with a certain chemical composition, stable chromium nitride (Cr2N) formation was observed when only Nb was added, whereas combined addition of Nb and V suppressed the formation of Cr2N and produced extremely fine precipitates in the steel (in lath martensite). The fine precipitates could be observed in thin film samples by using a high-resolution transmission electron microscope (TEM). In order to evaluate the state of formation of the fine precipitates in the steel quantitatively, the difference in the precipitation behaviors between the two materials was investigated by the size-classified quantitative analysis method. This method is considered to be a useful analytical technique in the development and design of high performance steels using fine nitrides and carbides with sizes of the several nm order. |
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| AbstractList | Fine precipitates in steel have various effects on the properties of steel products. Therefore, it is important to investigate the state of existence of precipitates in steel in order to consider their effect on the material. In this study, the size and shape of Nb and V precipitates were observed by electron microscopy and the amount of precipitates was evaluated by electrolytic extraction analysis in martensitic stainless steels which has excellent heat resistance. For steels with a certain chemical composition, stable chromium nitride (Cr2N) formation was observed when only Nb was added, whereas combined addition of Nb and V suppressed the formation of Cr2N and produced extremely fine precipitates in the steel (in lath martensite). The fine precipitates could be observed in thin film samples by using a high-resolution transmission electron microscope (TEM). In order to evaluate the state of formation of the fine precipitates in the steel quantitatively, the difference in the precipitation behaviors between the two materials was investigated by the size-classified quantitative analysis method. This method is considered to be a useful analytical technique in the development and design of high performance steels using fine nitrides and carbides with sizes of the several nm order. |
| ArticleNumber | ISIJINT-2021-401 |
| Author | Yamada, Katsumi Ishida, Tomoharu Yamauchi, Katsuhisa |
| Author_xml | – sequence: 1 fullname: Ishida, Tomoharu organization: Materials Integration Research Department, Steel Research Laboratory, JFE Steel Corporation – sequence: 1 fullname: Yamada, Katsumi organization: Functional Materials Solution Division, Nano-scale Characterization Center, JFE Techno-Research Corp – sequence: 1 fullname: Yamauchi, Katsuhisa organization: Products Design & Quality Control Dept. East Japan Works, JFE Steel Corporation |
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| Cites_doi | 10.1080/14786436008238300 10.1080/14786435608238074 10.2355/tetsutohagane1955.76.4_483 10.1016/0001-6160(53)90006-6 10.2355/isijinternational.34.17 10.2355/tetsutohagane.99.669 |
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| References_xml | – reference: 1) G. K. Williamson and W. H. Hall: Acta Metall., 1 (1953), 22. https://doi.org/10.1016/0001-6160(53)90006-6 – reference: 2) G. K. Williamson and R. E. Smallman: Philos. Mag., 1 (1956), 34. https://doi.org/10.1080/14786435608238074 – reference: 4) T. Takayama and S. Hinotani: Bunseki, 12 (1995), 996 (in Japanese). – reference: 10) J. E. Bailey and P. B. Hirsch: Philos. Mag., 5 (1960), 485. https://doi.org/10.1080/14786436008238300 – reference: 6) H. Yasuhara: Bull. Iron Steel Inst. Jpn., 4 (1999), 216 (in Japanese). – reference: 8) A. Chino: 55th Shiraishi Memorial Seminar, ISIJ, Tokyo, (2004), 59 (in Japanese). – reference: 3) Japan Society for the Promotion of Science, 19th Committee on Steelmaking: Kouchu Hikinzoku Kaizaibutsu Kenkyu no Saikin no Tenkai (Recent Developments in the Study of Non-Metallic Inclusions in Steel), Japan Society for the Promotion of Science, 19th Committee on Steelmaking, Tokyo, (1994), 206 (in Japanese). – reference: 7) S. Hinotani, J. Endo, T. Takayama, N. Mizui and Y. Inokuma: ISIJ Int., 34 (1994), 17. https://doi.org/10.2355/isijinternational.34.17 – reference: 5) F. Kurosawa and M. Saeki: Tetsu-to-Hagané, 76 (1990), 483 (in Japanese). https://doi.org/10.2355/tetsutohagane1955.76.4_483 – reference: 11) Y. Murase, N. Iwasa, Y. Takemoto and T. Senuma: Tetsu-to-Hagané, 99 (2013), 669 (in Japanese). https://doi.org/10.2355/tetsutohagane.99.669 – reference: 9) S. Kinoshiro and T. Ishida: Analytical Method of Precipitates and/or Inclusions in Metallic Material, Patent JP4737278, (2011). – reference: 12) S. Kinoshiro and T. Ishida: Quantitative Method of Precipitates and/or Inclusions in Metallic Material, Patent JP5298810, (2013). – ident: 3 – ident: 10 doi: 10.1080/14786436008238300 – ident: 2 doi: 10.1080/14786435608238074 – ident: 5 doi: 10.2355/tetsutohagane1955.76.4_483 – ident: 4 – ident: 12 – ident: 6 – ident: 9 – ident: 8 – ident: 1 doi: 10.1016/0001-6160(53)90006-6 – ident: 7 doi: 10.2355/isijinternational.34.17 – ident: 11 doi: 10.2355/tetsutohagane.99.669 |
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| SubjectTerms | fine precipitate heat resistance size-classified quantitative analysis method stainless steel transmission electron microscope |
| Title | Analysis of the Generation State of Fine Precipitates in Steel |
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